Fish oil is a fatty acid that occurs naturally in our bodies, especially in our cell membranes. Fish oil can be obtained by eating oily fish or taking supplements. Today, several studies show that fish oil has an important effect on the whole human body. There is good evidence that fish oil can help maintain a healthy heart, protect eye health and boost the immune system. Fish oil is also very important for pregnant or breastfeeding women as it helps the baby's nervous system develop properly.